Paraffin scraper



P. M. REA

PARAFIN 'SCRAPER July 26, 1938.

2 Sheets-Sheet l Filed Sept. 3, 1937 FIG. 3

\ I INVENTOR FIGI ATTORNEY Patented July 26, 1938 um'rao sTArEs PATENT OFFICE 2 Claims.

My, invention relates to tools for removing paraffin accumulation in well tubing and casing.

The prime object of the invention is the provision of a tool which may be used either in 5 connection with a rod string or a cable line.

Another object is to so design such a tool that it will not catch in casing or tubing cavities lying between adjacent ends of its sections, when the device is lowered and raised therein.

a'device of the class described which will be strong and durable; the movable parts of which may be easily and quickly replaced when worn or broken; which is positive in action; and, which will be eiiicient in accomplishing all of the purposes for which it is intended.

With these and other objects in view aswill more fully appear, the invention consists in the construction, novel features, and combination of parts pointed out in the claims hereto appended and illustrated in the accompanying two-sheet drawing, in which:

Figure 1 is an elevational view of one embodiment of the invention, within a section of tubing the collapsed position of the scraper wings being shown in dotted lines;

Figure 2, is a sectional view taken substantially along the lines 2-2 of Figure 1;

Figure 3 is a sectional view taken substantially along the line 3-3 of Figure 1; and,

' Figure 4 is a fragmentary vertical sectional view showing a slightly different arrangement of the scraper wings.

Like characters of reference designate like parts in all of the figures.

The invention is susceptible of embodiment in various forms, one of which is illustrated in the drawings wherein:

The reference numerals l indicate as a whole, 40 an elongated body being square, rectangular or polygonal in cross-section, and having its upper end equipped with a threaded means 2 for attachment to either a rod section or a cable line connector, not shown. Intermediate its ends the body I, is provided with a plurality of integral outstanding vanes or ribs 3 the upper end surfaces of which lie in a single plane perpendicular to the axis of the body. The outer surface of each vane is bevelled downwardly and inwardly as shown at 4. Any desired number of Other objects of the invention are to provide wings comprises two complemental halves A and B the outer surfaces or edges of which are substantially semi-circular in configuration and which together practically fill or close the bore of awell tubing or casing I when resting upon the upper ends of the vanes 3. The halves A and B are provided at their mating edges with intermeshing ears 8 alignedly bored to receive the pivot pin 6,

Adjacent the periphery of each of the halves A and B are provided two or more upstanding lugs or projections 9 each of which has an in v wardly and upwardly bevelled outer surface It).

The lowermost set of the vanes 3, instead of being bevelled inwardly to the outer surface of the body I, are bevelled to a common point II.

In operation, the device is lowered into the tubing. or casing 1 upon the lower end of either a rod string or cable, the point ll acting to open a passage in the paraflin for the body I. During the lowering operation the wings are folded upwardly as illustrated in dotted lines in Fig. 1, and consequently the tool will pass through paraffin deposited on the inner surface of the tubmg, or casing.

When the tool is raised, the wings assume their full line position and almost completely fill the cross-sectional area of the tubing or casing, and consequently the paraiiin adhering thereto will also be raised. During the raising operation the lugs 9 and their bevelled surfaces I0 act to prevent entry of the outer edges of the Wings in cavities usually present between sections of the pipe string.

From the foregoing description it may be seen that the device may be used upon either a rod string or cable; that it may be run into a restricted pipe bore; that the wing sections are either or both quickly replaceable by removal of. the pin 6; that the upper ends of the vanes 3 act as a positive seat for the wings; that the lugs 9 prevent the tool from hanging in the pipe; and, that the single piece body construction lends durability and strength to the tool.

By positively pivoting the wing sections to the body in contradistinction to pivoting them to each other and permitting them slidable movement with relation to the body, danger of the wings folding downwardly or buckling under stress is eliminated.

If desired, a means such as 2 may be employed at the lower end of the body to attach the device between sections of a rod string.

In Figure 4 is illustrated an embodiment of the invention wherein the wing sections are individually pivoted to the body in spaced relation to each other. This embodiment, while more expensive to manufacture, relieves a portion of the stress placed upon the pivot pin in the first embodiment, and permits individual replacement of the sections. 0! course, the wing sections could, if desired, be located in various radial positions with relation to the body.

I claim:

1. An elongated body polygonal in cross-section, means at the upper end of the body for connecting it to a support, a pair of oppositely disposed substantially semi-cylindrical scraper wings complementally enveloping and pivoted transversely to the body and to each other, said wings complementally forming a disc when in their extended positions, longitudinally extending radially spaced ribs carried by the body, their upper ends supporting the wings when in outstanding positions, and a point carried by the lower end of the body. said point being formed of a plurality of outstanding downwardly tapered ribs.

2. An elongated body polygonal in cross-section, means at the upper end of the body for connecting it to a support, a pair of oppositely disposed substantially semi-cylindrical scraper wings complementally enveloping and pivoted transversely to the body and to each other, said wings 'complementally torminga disc when in their extended positions, longitudinally extending radially spaced ribs carried by the body, their upper ends supporting the wings when in outstanding positions, means for preventing the wings from becoming fouled by cavities in a pipe therearound, and a point carried by the lower end 0! the body, said point being formed of a plurality of outstanding downwardly tapered ribs. 

